source: branches/3.2/mindi-busybox/util-linux/losetup.c @ 3232

Last change on this file since 3232 was 3232, checked in by Bruno Cornec, 7 years ago
  • Update mindi-busybox to 1.21.1
File size: 2.8 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini losetup implementation for busybox
4 *
5 * Copyright (C) 2002  Matt Kraai.
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8 */
9
10//usage:#define losetup_trivial_usage
11//usage:       "[-r] [-o OFS] LOOPDEV FILE - associate loop devices\n"
12//usage:       "    losetup -d LOOPDEV - disassociate\n"
13//usage:       "    losetup [-f] - show"
14//usage:#define losetup_full_usage "\n\n"
15//usage:       "    -o OFS  Start OFS bytes into FILE"
16//usage:     "\n    -r  Read-only"
17//usage:     "\n    -f  Show first free loop device"
18//usage:
19//usage:#define losetup_notes_usage
20//usage:       "No arguments will display all current associations.\n"
21//usage:       "One argument (losetup /dev/loop1) will display the current association\n"
22//usage:       "(if any), or disassociate it (with -d). The display shows the offset\n"
23//usage:       "and filename of the file the loop device is currently bound to.\n\n"
24//usage:       "Two arguments (losetup /dev/loop1 file.img) create a new association,\n"
25//usage:       "with an optional offset (-o 12345). Encryption is not yet supported.\n"
26//usage:       "losetup -f will show the first loop free loop device\n\n"
27
28#include "libbb.h"
29
30int losetup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
31int losetup_main(int argc UNUSED_PARAM, char **argv)
32{
33    unsigned opt;
34    int n;
35    char *opt_o;
36    unsigned long long offset = 0;
37    enum {
38        OPT_d = (1 << 0),
39        OPT_o = (1 << 1),
40        OPT_f = (1 << 2),
41        OPT_r = (1 << 3), /* must be last */
42    };
43
44    /* max 2 args, -d,-o,-f opts are mutually exclusive */
45    opt_complementary = "?2:d--of:o--df:f--do";
46    opt = getopt32(argv, "do:fr", &opt_o);
47    argv += optind;
48
49    if (opt == OPT_o)
50        offset = xatoull(opt_o);
51
52    if (opt == OPT_d) {
53        /* -d BLOCKDEV */
54        if (!argv[0] || argv[1])
55            bb_show_usage();
56        if (del_loop(argv[0]))
57            bb_simple_perror_msg_and_die(argv[0]);
58        return EXIT_SUCCESS;
59    }
60
61    if (argv[0]) {
62        char *s;
63
64        if (opt == OPT_f) /* -f should not have arguments */
65            bb_show_usage();
66
67        if (argv[1]) {
68            /* [-r] [-o OFS] BLOCKDEV FILE */
69            if (set_loop(&argv[0], argv[1], offset, (opt / OPT_r)) < 0)
70                bb_simple_perror_msg_and_die(argv[0]);
71            return EXIT_SUCCESS;
72        }
73        /* [-r] [-o OFS] BLOCKDEV */
74        s = query_loop(argv[0]);
75        if (!s)
76            bb_simple_perror_msg_and_die(argv[0]);
77        printf("%s: %s\n", argv[0], s);
78        if (ENABLE_FEATURE_CLEAN_UP)
79            free(s);
80        return EXIT_SUCCESS;
81    }
82
83    /* [-r] [-o OFS|-f] with no params */
84    n = 0;
85    while (1) {
86        char *s;
87        char dev[LOOP_NAMESIZE];
88
89        sprintf(dev, LOOP_FORMAT, n);
90        s = query_loop(dev);
91        n++;
92        if (!s) {
93            if (n > 9 && errno && errno != ENXIO)
94                return EXIT_SUCCESS;
95            if (opt == OPT_f) {
96                puts(dev);
97                return EXIT_SUCCESS;
98            }
99        } else {
100            if (opt != OPT_f)
101                printf("%s: %s\n", dev, s);
102            if (ENABLE_FEATURE_CLEAN_UP)
103                free(s);
104        }
105    }
106    return EXIT_SUCCESS;
107}
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